[1] Martin P. Near-infrared diode laser spectroscopy in chemical process and environmental air monitoring[J]. Chemical Society Reviews, 31, 201-210(2002). http://onlinelibrary.wiley.com/doi/10.1002/chin.200239293/full

[2] Chen Y, Gao G Z, Cai T D. Detection technique of ethylene based on photoacoustic spectroscopy[J]. Chinese Journal of Lasers, 44, 0511001(2017).

[3] Sigrist M W, Bartlome R, Marinov D et al. Trace gas monitoring with infrared laser-based detection schemes[J]. Applied Physics B, 90, 289-300(2008). http://link.springer.com/article/10.1007/s00340-007-2875-4

[4] Yu R, Jiang Y S. Photoacoustic spectroscopy system with amplitude spectrum and phase spectrum measurement functions[J]. Acta Optica Sinica, 34, 0230001(2014).

[5] Dong L, Ma W G, Zhang L et al. Mid-IR ultra-sensitive CO detection based on pulsed quartz enhanced photoacoustic spectroscopy[J]. Acta Optica Sinica, 34, 0130002(2014).

[6] Li Z J, Chen W G, Ji Y et al. Micro gas measurement method based on dual wavelength modulation of distributed feedback laser[J]. Laser & Optoelectronics Progress, 54, 111404(2017).

[7] Tian L, Xing J G. Discussion on making decision about electric equipment for condition based maintenance[J]. Power System Technology, 28, 60-63(2004).

[8] Xiong H, Li W G, Song W et al. Application of density-based clustering technology in diagnosis of DGA data of transformer[J]. High Voltage Engineering, 34, 1022-1026(2008).

[9] Zhao W Q, Zhu Y L, Jiang B et al. Condition assessment for power transformers by Bayes networks[J]. High Voltage Engineering, 34, 1032-1039(2008).

[10] Zhang X X, Liu H, Zhang Y et al. Quantum detection of trace acetylene gas based on the peak area of photoacoustic spectroscopy[J]. High Voltage Engineering, 41, 857-863(2015).

[11] Wang H J, Ma S J, Yu H M et al. Cause analysis and corresponding countermeasures of acetylene overproof phenomenon in unused transformer oil[J]. Lubrication Oil, 4, 44-47(2015).

[12] National Standardization TechnicalCommittee. Guide to the analysis and the diagnosis of gases dissolved in transformer oil: GB/T 7252-2001[S]. Beijing: China Standard Press, 2001.

[13] Kauppinen J, Wilcken K, Kauppinen I et al. High sensitivity in gas analysis with photoacoustic detection[J]. Microchemical Journal, 76, 151-159(2004). http://www.sciencedirect.com/science/article/pii/S0026265X03001577

[14] Wang Q Y, Wang J W, Li L et al. An all-optical photoacoustic spectrometer for trace gas detection[J]. Sensors and Actuators B: Chemical, 153, 214-218(2011). http://www.sciencedirect.com/science/article/pii/S0925400510008531

[15] Gong Z F, Chen K, Yang Y et al. High-sensitivity fiber-optic acoustic sensor for photoacoustic spectroscopy based traces gas detection[J]. Sensors and Actuators B: Chemical, 247, 290-295(2017). http://www.sciencedirect.com/science/article/pii/S0925400517304197

[16] Yin Q R, Wang T, Qian M L et al[M]. Photoacoustic and photothermal technologies and their applications(1991).

[17] Karbach A, Hess P. High precision acoustic spectroscopy by laser excitation of resonator modes[J]. The Journal of Chemical Physics, 83, 1075-1084(1985). http://scitation.aip.org/content/aip/journal/jcp/83/3/10.1063/1.449470

[18] Mao X F, Zhou X L, Yu Q X. Stabilizing operation point technique based on the tunable distributed feedback laser for interferometric sensors[J]. Optics Communications, 361, 17-20(2016). http://www.sciencedirect.com/science/article/pii/S0030401815302066